:root {
  /* 基础主色调: 电光蓝与极光紫 */
  --primary-color: #4f46e5;
  --secondary-color: #7c3aed;
  --bg-gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  
  /* 文本颜色 */
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #f8fafc;
  
  /* 背景与表面层 */
  --body-bg: #f3f4f6;
  --surface-bg: #ffffff;
  
  /* 毛玻璃拟态 (Glassmorphism) */
  --glass-bg: rgba(255, 255, 255, 0.15);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);

  /* 阴影效果层级 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 20px 30px -5px rgba(0, 0, 0, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* 圆角大小 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 9999px;

  /* 过渡动画时长 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 全局重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--body-bg);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 隐藏滚动条增强现代感 (可选) */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--body-bg);
}
::-webkit-scrollbar-thumb {
  background-color: #cbd5e1;
  border-radius: var(--radius-pill);
}

/* 毛玻璃 Header */
.header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(0,0,0,0.05);
  box-shadow: var(--shadow-sm);
  transition: background 0.3s ease;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 为了搭配白底 Header，标题文字重新采用暗色调，但带一点渐变 */
.header h1 { 
  font-size: 22px; 
  font-weight: 800;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.5px;
}
.header h1 span { 
  font-size: 13px; 
  opacity: 0.8; 
  font-weight: 500; 
  margin-top: 4px; 
  -webkit-text-fill-color: var(--text-muted); /* 重置子元素的颜色覆盖为主流灰色 */
  display: inline-block;
  margin-left: 10px;
}

/* 搜索框：轻度玻璃拟态 */
.search-box {
  display: flex;
  background: var(--body-bg);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-pill);
  overflow: hidden;
  transition: var(--transition);
}
.search-box:focus-within {
  background: var(--surface-bg);
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}
.search-box input {
  border: none;
  background: transparent;
  padding: 12px 24px;
  color: var(--text-main);
  font-size: 15px;
  width: 280px;
  outline: none;
}
.search-box input::placeholder {
  color: #94a3b8;
}
.search-box button {
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: 12px 20px;
  cursor: pointer;
  font-size: 18px;
  transition: var(--transition);
}
.search-box button:hover {
  color: var(--primary-color);
  transform: scale(1.1);
}

/* 英雄区 (Hero) */
.hero {
  background: var(--bg-gradient);
  padding: 80px 20px;
  text-align: center;
  color: var(--text-light);
  position: relative;
  overflow: hidden;
}
/* 英雄区：背景装饰光晕 */
.hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%; right: -5%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero h2 {
  font-size: 44px;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -1px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.hero p {
  font-size: 18px;
  opacity: 0.95;
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
  font-weight: 400;
}
.hero .stats {
  display: flex;
  justify-content: center;
  gap: 50px;
  margin-top: 40px;
}
.hero .stat {
  text-align: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 16px 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--glass-shadow);
  transition: var(--transition);
}
.hero .stat:hover {
  transform: translateY(-5px);
  background: rgba(255,255,255,0.25);
}
.hero .stat .num {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 4px;
}
.hero .stat .label {
  font-size: 14px;
  opacity: 0.9;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* 主容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

/* 面包屑导航 */
.breadcrumb {
  max-width: 1200px;
  margin: -20px auto 20px;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-muted);
}
.breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}
.breadcrumb a:hover {
  text-decoration: underline;
}

/* 分类筛选面板 */
.categories {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.cat-btn {
  padding: 10px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: var(--surface-bg);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.cat-btn:hover {
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.cat-btn.active {
  background: var(--bg-gradient);
  color: #fff;
  box-shadow: var(--shadow-md);
  transform: scale(1.05); /* 激活时细微放大 */
}

/* 邮件订阅区 */
.newsletter {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  text-align: center;
  color: var(--text-main);
  margin-bottom: 50px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid #f1f5f9;
}
/* 增加 newsletter 内的一点背景装缀 */
.newsletter::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 6px;
  background: var(--bg-gradient);
}
.newsletter h3 {
  font-size: 26px;
  margin-bottom: 12px;
  font-weight: 800;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.newsletter p {
  color: var(--text-muted);
  margin-bottom: 25px;
  font-size: 16px;
}
.newsletter .email-form {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: 480px;
}
.newsletter input {
  flex: 1;
  padding: 16px 20px;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-md);
  font-size: 15px;
  transition: var(--transition);
  outline: none;
}
.newsletter input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.newsletter button {
  padding: 16px 32px;
  background: var(--bg-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}
.newsletter button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* 布局结构 */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  align-items: start;
}
@media (max-width: 992px) {
  .main-layout { grid-template-columns: 1fr; }
}

/* Section 基础样式 */
.section { margin-bottom: 50px; }
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 25px;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 12px;
}
.section h3 {
  font-size: 22px;
  color: var(--text-main);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section h3 span {
  font-size: 12px;
  background: #ffe4e6;
  color: #e11d48;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  vertical-align: middle;
  letter-spacing: 1px;
}
.section a {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}
.section a:hover {
  color: var(--secondary-color);
  transform: translateX(3px);
}

/* 工具卡片网格系统 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 25px;
}

/* 工具卡片 (Tool Card) 高级拟态设计 */
.tool-card {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.03);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}
/* 卡片悬浮动画 */
.tool-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(79, 70, 229, 0.2);
}
/* 进场动画辅助类 */
.tool-card.fade-in {
  animation: slideUp 0.5s ease backwards;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.tool-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 18px;
  box-shadow: inset 0 -2px 5px rgba(0,0,0,0.05); /* 内阴影增加立体感 */
}
.tool-card h4 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--text-main);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.tool-card .desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

/* 标签系统 */
.tool-card .tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.tool-card .tag {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
  color: var(--text-muted);
  font-weight: 500;
  transition: var(--transition);
}
.tool-card:hover .tag {
  background: #e0e7ff;
  color: var(--primary-color);
}
.tool-card .tag.hot {
  background: #fef2f2;
  color: #ef4444;
}
.tool-card .tag.free {
  background: #f0fdf4;
  color: #16a34a;
}
.tool-card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  border-top: 1px dashed #e2e8f0;
}
.tool-card .rating {
  color: #eab308;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}
.tool-card .visits {
  color: #94a3b8;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 侧边栏 (Sidebar) 优化 */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 30px;
}
.sidebar-card {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.03);
}
.sidebar-card h4 {
  font-size: 18px;
  margin-bottom: 20px;
  color: var(--text-main);
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 2px solid #f1f5f9;
}
.sidebar-card ul { list-style: none; }
.sidebar-card li {
  padding: 12px 0;
  border-bottom: 1px solid #f8fafc;
  font-size: 14px;
}
.sidebar-card li:last-child { border-bottom: none; }
.sidebar-card li a {
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  display: flex;
  align-items: center;
}
.sidebar-card li a::before {
  content: '→';
  color: var(--text-muted);
  margin-right: 8px;
  font-size: 12px;
  opacity: 0;
  transform: translateX(-10px);
  transition: var(--transition);
}
.sidebar-card li a:hover {
  color: var(--primary-color);
  padding-left: 5px;
}
.sidebar-card li a:hover::before {
  opacity: 1;
  transform: translateX(0);
  color: var(--primary-color);
}

/* 内部动态加载文章列表的特有样式覆盖 */
.sidebar-card #articleList li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar-card #articleList li .date {
  font-size: 12px;
  color: #94a3b8;
}
.sidebar-card #articleList li .title {
  color: var(--text-main);
  font-weight: 500;
  font-size: 15px;
  text-decoration: none;
  transition: var(--transition);
}
.sidebar-card #articleList li .title:hover {
  color: var(--primary-color);
}

/* 特殊角标 */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge-new { background: #10b981; color: #fff; }
.badge-hot { background: #ef4444; color: #fff; }
.badge-pick { background: #f59e0b; color: #fff; }

/* 页脚区域 */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 50px 24px;
  text-align: center;
  margin-top: 60px;
  border-top: 4px solid var(--primary-color);
}
.footer a {
  color: #cbd5e1;
  text-decoration: none;
  transition: var(--transition);
}
.footer a:hover {
  color: #fff;
}
.footer-links {
  margin-top: 25px;
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 14px;
  font-weight: 500;
}

/* ========== 工具详情页 & 文章页样式 ========== */

/* 文章容器 */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 24px 60px;
}

/* 工具头部 */
.tool-header {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0,0,0,0.03);
}
.tool-header-top {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.tool-icon-lg {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  flex-shrink: 0;
  box-shadow: inset 0 -2px 5px rgba(0,0,0,0.05);
}
.tool-header-info {
  flex: 1;
}
.tool-header-info h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.tool-header-info .subtitle {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}
.rating-bar {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

/* 工具元信息 */
.tool-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid #e2e8f0;
  border-bottom: 1px solid #e2e8f0;
  margin-bottom: 20px;
}
.tool-meta-item {
  font-size: 14px;
  color: var(--text-muted);
}
.tool-meta-item strong {
  color: var(--text-main);
}

/* 操作按钮 */
.action-bar {
  display: flex;
  gap: 12px;
}
.action-btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}
.action-btn-primary {
  background: var(--bg-gradient);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.action-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: #fff;
}

/* 功能网格 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}
.feature-item {
  background: var(--surface-bg);
  padding: 16px;
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.03);
  transition: var(--transition);
}
.feature-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--primary-color);
}

/* 文章正文 */
.article-body {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.03);
  line-height: 1.8;
  font-size: 16px;
  color: var(--text-main);
}
.article-body h1 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.3;
}
.article-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #e2e8f0;
}
.article-body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 12px;
}
.article-body p {
  margin-bottom: 16px;
  color: #334155;
}
.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 16px;
}
.article-body li {
  margin-bottom: 8px;
  color: #334155;
  line-height: 1.7;
}
.article-body strong {
  color: var(--text-main);
  font-weight: 600;
}
.article-body code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  color: #e11d48;
}
.article-body pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.6;
}
.article-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}
.article-body blockquote {
  border-left: 4px solid var(--primary-color);
  padding: 12px 20px;
  margin: 16px 0;
  background: #f8fafc;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: #475569;
  font-style: italic;
}

/* 表格样式 */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}
.article-body table th {
  background: var(--bg-gradient);
  color: #fff;
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
}
.article-body table th:first-child {
  border-radius: var(--radius-sm) 0 0 0;
}
.article-body table th:last-child {
  border-radius: 0 var(--radius-sm) 0 0;
}
.article-body table td {
  padding: 12px 16px;
  border-bottom: 1px solid #e2e8f0;
  color: #334155;
}
.article-body table tr:hover td {
  background: #f8fafc;
}
.article-body table tr:last-child td:first-child {
  border-radius: 0 0 0 var(--radius-sm);
}
.article-body table tr:last-child td:last-child {
  border-radius: 0 0 var(--radius-sm) 0;
}

/* 优缺点 */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}
@media (max-width: 640px) {
  .pros-cons { grid-template-columns: 1fr; }
}
.pros-cons .pros,
.pros-cons .cons {
  background: var(--surface-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.03);
}
.pros-cons h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}
.pros-cons ul {
  list-style: none;
  padding: 0;
}
.pros-cons li {
  padding: 8px 0;
  border-bottom: 1px dashed #e2e8f0;
  font-size: 14px;
  color: #334155;
}
.pros-cons li:last-child {
  border-bottom: none;
}

/* 相关推荐 */
.related-tools {
  margin-bottom: 32px;
}
.related-tools h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}
.related-card {
  background: var(--surface-bg);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.03);
  transition: var(--transition);
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 70, 229, 0.2);
}

/* 工具页头部响应式 */
@media (max-width: 640px) {
  .tool-header-top {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .tool-header-info h2 {
    justify-content: center;
  }
  .article-body {
    padding: 24px 16px;
  }
  .tool-header {
    padding: 20px;
  }
}